Sort + Filter
Replacement Sensors for Solar Hot Water Systems
Your solar hot water system uses temperature sensors to tell the controller when to run the pump. Most systems have two: a roof sensor at the collector and a tank sensor at the storage tank. When a sensor fails, the controller receives bad information — and your hot water goes with it.
We stock over 80 replacement roof and tank sensors covering most Australian solar hot water systems, including many no longer supported by the original manufacturer.
✔ Signs a sensor has failed
- No hot water despite clear, sunny weather
- Pump running constantly, or not running at all
- Obviously incorrect temperature readings on the controller
- Controller showing a sensor fault or error code
- System overheating or shutting itself down
✔ Roof sensor or tank sensor?
- Roof sensor — mounted at the collector, usually on a long lead (2.5m, 15m or 20m depending on the system). The most common failure, because it lives in the weather.
- Tank sensor — mounted at or inside the storage tank, usually a short lead. Fails less often, and is harder to diagnose.
- If you're unsure, replace both. They're inexpensive next to a second call-out, and a matched pair removes the guesswork.
✔ Finding the right one
Sensors are not universal — plug type, lead length and resistance curve all have to match your controller. Search by your system brand (Solahart, Rheem, Chromagen, Hills Esteem or Apollo, Dux, Rinnai Sunmaster, Apricus, Thermann, Saxon, AAE, Edson, SolarArk, Zen, Endless Solar) or by your controller brand (Senztek, RESOL, Aestiva).
✔ Why buy from us
- Specialists in solar hot water sensors, including discontinued systems
- Free thermal heat paste included with most sensors
- Same-day dispatch on orders before 3pm, free delivery over $150
- Practical repair experience — we'll help you identify the part
✔ Not sure which you need?
Email sales@solarhotwaterparts.com.au with your system brand, model and a photo of the old sensor's plug, and we'll match it.
